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<div class="title">Registering operator behaviours </div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><p>In order for AngelScript to know how to work with the application registered types, it is necessary to register some behaviours, for example for memory management.</p>
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<p>The memory management behaviours are described with the registration of <a class="el" href="doc_reg_basicref.html">reference types</a> and <a class="el" href="doc_register_val_type.html">value types</a>.</p>
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<p>Other advanced behaviours are described with the <a class="el" href="doc_advanced_api.html">advanced types</a>.</p>
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<p>Most behaviours are implemented as ordinary class methods, except with specific names that the compiler can understand.</p>
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<h1><a class="anchor" id="doc_reg_opbeh_1"></a>
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Operator overloads</h1>
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<p>In AngelScript all operator overloads are implemented as <a class="el" href="doc_script_class_ops.html">class methods with predefined names</a>, which is different from C++ where both class methods and global functions may be used. Especially the dual operators, i.e. those that take two operands, usually has one implemented as a class method, and a global function for the reverse order.</p>
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<p>To register C++ operator overloads you'll use the methods described in <a class="el" href="doc_register_func.html#doc_register_func_1">How to get the address of the application function or method</a>.</p>
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<p>Example on how to register operator overloads</p>
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<div class="fragment"><div class="line"><span class="keyword">class </span>MyClass</div>
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<div class="line">{</div>
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<div class="line"> ...</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// The operator 'MyClass - int' has been implemented as a method</span></div>
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<div class="line"> MyClass operator-(<span class="keywordtype">int</span>) <span class="keyword">const</span>;</div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// The operator 'int - MyClass' has been implemented as a global function</span></div>
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<div class="line"> <span class="keyword">static</span> MyClass operator-(<span class="keywordtype">int</span>, <span class="keyword">const</span> MyClass &);</div>
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<div class="line">}</div>
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<div class="line"> </div>
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<div class="line"><span class="keywordtype">void</span> RegisterMyClass(<a class="code" href="classas_i_script_engine.html">asIScriptEngine</a> *engine)</div>
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<div class="line">{</div>
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<div class="line"> <span class="comment">// Registering the operator 'MyClass - int'</span></div>
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<div class="line"> engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"MyClass"</span>, <span class="stringliteral">"MyClass opSub(int) const"</span>, <a class="code" href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a>(MyClass, <span class="keyword">operator</span>-, (<span class="keywordtype">int</span>) <span class="keyword">const</span>, MyClass), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a>); </div>
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<div class="line"> </div>
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<div class="line"> <span class="comment">// Registering the operator 'int - MyClass'</span></div>
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<div class="line"> engine-><a class="code" href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">RegisterObjectMethod</a>(<span class="stringliteral">"MyClass"</span>, <span class="stringliteral">"MyClass opSub_r(int) const"</span>, <a class="code" href="angelscript_8h.html#a153aee5a6228913a469b6e6867e54efb">asFUNCTIONPR</a>(<span class="keyword">operator</span>-, (<span class="keywordtype">int</span>, <span class="keyword">const</span> MyClass &), MyClass), <a class="code" href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253">asCALL_CDECL_OBJLAST</a>);</div>
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<div class="line">}</div>
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</div><!-- fragment --> </div></div><!-- contents -->
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<div class="ttc" id="aclassas_i_script_engine_html_ad74043be9cc30f105c62f482ca720574"><div class="ttname"><a href="classas_i_script_engine.html#ad74043be9cc30f105c62f482ca720574">asIScriptEngine::RegisterObjectMethod</a></div><div class="ttdeci">virtual int RegisterObjectMethod(const char *obj, const char *declaration, const asSFuncPtr &funcPointer, asDWORD callConv, void *auxiliary=0, int compositeOffset=0, bool isCompositeIndirect=false)=0</div><div class="ttdoc">Registers a method for the object type.</div></div>
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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4ac08652c72f1cc0dc81c37812fab0e253">asCALL_CDECL_OBJLAST</a></div><div class="ttdeci">@ asCALL_CDECL_OBJLAST</div><div class="ttdoc">A cdecl function that takes the object pointer as the last parameter.</div><div class="ttdef"><b>Definition:</b> angelscript.h:234</div></div>
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<div class="ttc" id="aclassas_i_script_engine_html"><div class="ttname"><a href="classas_i_script_engine.html">asIScriptEngine</a></div><div class="ttdoc">The engine interface.</div><div class="ttdef"><b>Definition:</b> angelscript.h:1092</div></div>
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<div class="ttc" id="aangelscript_8h_html_a153aee5a6228913a469b6e6867e54efb"><div class="ttname"><a href="angelscript_8h.html#a153aee5a6228913a469b6e6867e54efb">asFUNCTIONPR</a></div><div class="ttdeci">#define asFUNCTIONPR(f, p, r)</div><div class="ttdoc">Returns an asSFuncPtr representing the function specified by the name, parameter list,...</div><div class="ttdef"><b>Definition:</b> angelscript.h:684</div></div>
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<div class="ttc" id="aangelscript_8h_html_ac45ccb5854326cce38d721e2c00f1563"><div class="ttname"><a href="angelscript_8h.html#ac45ccb5854326cce38d721e2c00f1563">asMETHODPR</a></div><div class="ttdeci">#define asMETHODPR(c, m, p, r)</div><div class="ttdoc">Returns an asSFuncPtr representing the class method specified by class, method name,...</div><div class="ttdef"><b>Definition:</b> angelscript.h:742</div></div>
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<div class="ttc" id="aangelscript_8h_html_a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96"><div class="ttname"><a href="angelscript_8h.html#a3ec92ea3c4762e44c2df788ceccdd1e4aea516c8742acc1edff6a43dc1bb09e96">asCALL_THISCALL</a></div><div class="ttdeci">@ asCALL_THISCALL</div><div class="ttdoc">A thiscall class method.</div><div class="ttdef"><b>Definition:</b> angelscript.h:232</div></div>
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<li class="footer">Generated on Sat Dec 5 2020 23:20:24 for AngelScript by
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<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.18 </li>
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